[GitHub] [arrow] lidavidm commented on pull request #34079: GH-34077: [Go] Implement RunEndEncoded Scalar

["lidavidm (via GitHub)" <gi...@apache.org>]

lidavidm commented on PR #34079:
URL: https://github.com/apache/arrow/pull/34079#issuecomment-1423360477

   Then it seems weird to get a scalar by logical index as we do here, but changing the meaning of getting a scalar would also be inconsistent. 
   
   On Wed, Feb 8, 2023, at 18:06, Felipe Oliveira Carvalho wrote:
   > 
   > 
   > ***@***.**** commented on this pull request.
   > 
   > 
   > In go/arrow/scalar/scalar.go <https://github.com/apache/arrow/pull/34079#discussion_r1100774478>:
   > 
   > > +		runEnds := arr.RunEndsArr()
   > +		switch ends := runEnds.(type) {
   > +		case *array.Int16:
   > +			runLength = int64(ends.Value(physicalIndex))
   > +		case *array.Int32:
   > +			runLength = int64(ends.Value(physicalIndex))
   > +		case *array.Int64:
   > +			runLength = int64(ends.Value(physicalIndex))
   > +		}
   > 
   > @zeroshade <https://github.com/zeroshade> Antoine has suggested that I add a RunEndEncoded scalar type instead of adding hacks to make things work without it.
   > 
   >> To me, this scalar makes sense as representing the physical value for a physical index, but not the logical value for a logical index (if that makes...logical sense?)
   >> 
   > If you look at the REE array as an array of runs, the scalar that is typed by the REE type is a single run.
   > 
   > 
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